I need help with number 20 19. Determine the power developed by a manweighing 6.0 × 10² newtons who climbs a ropeat a constant speed of 2.0 meters per second.20. Student A lifts a 40.-newton box from the floorto a height of 0.30 meter in 2.0 seconds. StudentB lifts a 30.-newton box from the floor to aheight of 0.40 meter in 4.0 seconds. Comparedto student A, student B does(1) less work but develops more power(2) more work but develops less power(3) the same work but develops less power(4) the same work but develops more power21. A 5.0 × 10²-newton girl develops 250 watts ofpower as she runs up two flights of stairs to alanding a total of 5.0 meters vertically above herstarting point. Calculate the time required forthe girl to run up the stairs.22. A motor having a maximum power rating of8.1 x 10 watts is used to operate an elevatorwith a weight of 1.8 x 104 newtons. What isthe maximum weight this motor can lift at anaverage speed of 3.0 meters per second?(1) 6.0 x 10²³ N(3) 2.4 × 10 N(2) 1.8 x 104 N(4) 2.7 x 10* N38°FNch9:

Given For student-A Force applied by student B = 30 N Height upto which box is lifted = 0.40 m Time…

Answered: need help with number 20

Science

Physics

need help with number 20

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter7: Conservation Of Energy

Section: Chapter Questions

Problem 62P

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Question

I need help with number 20

19. Determine the power developed by a man
weighing 6.0 × 10² newtons who climbs a rope
at a constant speed of 2.0 meters per second.
20. Student A lifts a 40.-newton box from the floor
to a height of 0.30 meter in 2.0 seconds. Student
B lifts a 30.-newton box from the floor to a
height of 0.40 meter in 4.0 seconds. Compared
to student A, student B does
(1) less work but develops more power
(2) more work but develops less power
(3) the same work but develops less power
(4) the same work but develops more power
21. A 5.0 × 10²-newton girl develops 250 watts of
power as she runs up two flights of stairs to a
landing a total of 5.0 meters vertically above her
starting point. Calculate the time required for
the girl to run up the stairs.
22. A motor having a maximum power rating of
8.1 x 10 watts is used to operate an elevator
with a weight of 1.8 x 104 newtons. What is
the maximum weight this motor can lift at an
average speed of 3.0 meters per second?
(1) 6.0 x 10²³ N
(3) 2.4 × 10 N
(2) 1.8 x 104 N
(4) 2.7 x 10* N
38°F
N
ch
9:

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